HOMER Grid 1.10

The generator heat recovery ratio input is relevant only for cogeneration systems, also called combined-heat-and-power systems or CHP systems. These systems serve both electric and thermal loads, with waste heat recovered from the generator meeting some or all of the thermal load. If you do not want to model a cogeneration system, leave this input at zero.

HOMER assumes that the generator converts all of the fuel's energy into electricity and heat. The generator's fuel curve specifies how much electricity it produces for a given fuel input. HOMER assumes the remaining fuel energy is converted to heat. The heat recovery ratio is the percentage of the heat that can be recovered to serve the thermal load.